However, even with all of his corruption and hatred and selfishness and thirst for power and general being a bastard, as Itachi puts it later in Shippuden, Sasuke is "pure". He's painfully easy to corrupt, to push and manipulate to someone's will; he hates and lives the rest of his life exactly the way Itachi told him to, simply because he was instructed to. He's bent to Orochimaru's will because Orochimaru tells him that he has potential and that he could have enough strength to kill Itachi if he gives himself to the Sound. In Shippuden, he turns right back around and swears to utterly annihilate Konoha because Madara gave him the right push by telling him the truth behind the Uchiha massacre and Itachi's death and painted the village in the worst possible light. Sasuke is still naive and trapped in his own world where anyone can fashion him to their liking if they have the right tools.

First Person (entry type):

... Hn. Is it even worth risking your life for something? Some idiots I know do it for just about anything, but I wouldn't take an answer from someone like Naruto in a million years. Why are things so important that you'd die for them? There's no point. If you keep on living without it, that's fine. Tch, you've gotta be kidding me. Like I'm one to talk.

There are things more important. Things to keep living for. Right? Goals. People have things they live for, not things they'd die for. It's only okay to die once your ambitions are finished with. Ugh, why am I even bothering with this? I'll probably get stupid answers that are just the same as if I asked that loser.